Remotely controlled radio receiving system



June 13, 1933. v. M. GRAHAM 1,913,432

REMOTELY CONTROLLED RADIO RECEIVING SYSTEM Fi1ed Sept. 5. 1929 INVENTORvuzen. M. GRRHBM BY A.

ATTORNEY Patented June 7 13, 1933 I VIRGIL M. GRAHAM, or ROCHESTER; NEWYORK, TELEPHONE MANUFACTURING coMr ANY, or

RATION or NEW YORK ROCHESTER, NEW YORK, A CORPO- REMOTELY CONTROLLEDRADIO RECEIVING SYSTEM a Application iled e tember 5, 19 29; Serial No.390,529; g

' This invention relates to signalling systems and more particularly toradio receiving systems in which .a radio receiver is con trolled from aremote point.'

In radio receivers and espec ally thoseprovided with automatic means formaintaining the signal volume at a predetermined level, it is desirableto providefmeans fordisabllng the loud speaker during the tuning of there;

ceiver from one station to another so. that the background noises andmutilatedsignals will notbe reproduced, This result is especiallydesirable when the radio receiver is tuned or adjusted by equipmentcontrolled from a remote point. 5'

In accordance with the. present invention means are provided in aremotely controlled radio receiving system for disabling either aportion of the radio receiver-[or the loud speaker during the periodthat theradio receiver is being tuned. Afurther feature o'f theinvention includes means governed by the motor utilizedto, effect theiremotecontrol of the radio receiver for disabling the loud speaker orthe radio receiver during thetuning operation. The drawingdiagrammatically represents a remotely controlled radio receiving systemin which the radio receiver ofthe type similar to that more completelydisclosed in my co-pending application Serial No. 374,309,

filed-July 28, 1929, is,prov1ded with an an- I tenna 5, three tunedradio frequency stages and a detectorstage in cascade, respectivelydesignated 6,7, 8 and 9, each of which stages is tuned by one of thecondenser units 10, 11, 12 and 13 by-a commonshaft 14. The output of thedetector 9 is coupled to an audio amplifier 15 which may include onecrmore audio amplifying stages linked in cascade and connected to a loudspeaker 16.

The shaft 14: of the multi-unit'tuning condenser may be adjustedmanually to effect the desired tuning of the radio receiver in whichcase a manual key 17 located at the receiver may be closed to shortcircuit the loud speaker 16 during the tuning operation. However, thepresent arrangement is particularly adapted for a system in which theshaft 14: of the multi-unit condenser is actuated by a reversible motor18 controlled from aremote pointin a mannersimilar to that' disclosed inthe patent to Winfred 1,738,262, granted December 3, 1929. In the lastmentioned application, a motor such as 18 actuated either clockwiseorcounterclockwlse under the control of adjustable equip ment at one ormore remote control stations,

T. Powell, No.

ASSIGNOR T0 STROMBER'G-GARLSON rotates the shaft 14 or. the multi-unitcon.-

denser to any desired position to effect the desired tuning of the radioreceiver. 7

Infaccordance with the present invention means are providedforedisabling the'loud speaker of aremotely controlled radio receiverduring the tuning operation, which in the preferred form includes aflyball governor l9' mounted on the shaft of the motor or actuatedthereby [so that as the motor rotates'the member 20 controlled by thegovernor will closethe contacts 21 thereby short 'circuiting 'th'eloudspeaker 16 over conductors22 and 23,

The radio recelver herein disclosed may or may not be provided withmeans for automatically maintaining the signal volumeat a predeterminedlevel such asis disclosed in my 'co-pending application, and althoughtheinvention has been shown applied to a radio receiver of the tunedradio frequency type,,it is also applicable to other types of radioreceivers. V

The present disclosure is for purposes of illustration only and it willbe understood that there may be many modifications and variations in thepresent-invention without departing from the spirit thereof.

What I claim is:

i. 1. In a remotely controlled radio receiving system, a radio receiverhav ng a tuning control and a loud speaker connected thereto, a

motor' for actuatingsaid tuning control,

means at a remote point for effecting the operation of said motor, andmeans including a centrifugal governor actuated by said motor forsilencing the loud speaker duringthe tuning-operation. v f Y 2. In aremotely controlled radio receiving system, a radio receiver having atuning control and having a loud speakerv connectedthereto, a motor foractuating said tuning control, means at a remote point for effecting theoperation of said motor, a centrifugal governor actuated by said motor,and means controlled by said governor for short circuiting said loudspeaker during the tuning operation.

3. In a remotely controlled radioreceiving system, a radio receiverhaving a tuning control, a loud speaker connected to said radio receiverby a pair ofconductors, a rotary motor including a rotatable shaft foractuating said tuning control, means at a remote point for effectingrotation of said motor, a normally open switch connected across saidconductors, and means actuated by said shaft for closing said switchduring the operation of said motor.

4. In a. remotely controlled radio receiving system, a radio receiverhaving a tuning control, a loud speaker connected to said radio receiverby a pair of conductors, a rotary motor including a rotatable shaft foractuating said tuning control, means at a remote point for effectingrotation of said motor, and a normally open switch connected across saidconductors, said shaft serving to close said switch during the operationof said motor.

5. In a remotely controlled radio receiv ing system, a radio receiverhaving a tuning element and a loud speaker electrically connected tosaid radio receiver, a rotary motor for progressively actuating saidtuning element, sources of energizing potentials connected to said radioreceiver at all times during the operation thereof, means at a remotepoint for effecting the operation of said motor, and disabling meansconnected across said loud speaker by the rotation of said motor.

.6. In a remotely controlled radio receiving system, a radio receiverhaving a tuning element and having a loud speaker connected thereto, arotary motor for actuating said tuning element, means at a remote pointfor effecting the rotation of said motor, and means including a circuitconnected across said loud speaker by the rotation of said motor forsilencing the loud speaker during the tuning operation.

7. The method of operating a radio receiver and audio frequencytranslating means electrically connected thereto, which comprisescontinuously varying the tuning of the radio receiver from one wavelength to any one of a plurality of desired Wave lengths, by aprogressive uninterrupted adjusting movement controlled from a remotepoint, and silencing the audio frequency translating means in responseto a condition established and maintained in response to the adjustingmovement while maintaining all of said radio receiver completelyenergized.

8. The method of operating a radio receiver and audio frequencytranslating means electrically connected thereto, which comprisescontinuously and electrically varying the tuning of the radio receiverfrom one Wave length to any one of a plurality of desired wave lengthsby a progressive uninterrupted adjusting rotary movement controlled froma remote point, and silencing the audio frequency translating means inresponse to a condition established and maintained as a result of thecontinuance of the adjusting movement while maintaining said radioreceiver completely operative.

9. The method of operating a radio receiver and a loud speaker electrically connected thereto, which comprises continuously varying the tuningof the radio receiver'from one wave length to any one of a plurality ofdesired wave lengths, by a progressive uninterrupted adjusting movementcontrolled from a remote point, and effecting the silencing of the loudspeaker in response to a condition established and maintained as aresult of the adjusting movement by short circuiting said loud speakerwhile maintaining the radio receiver completely energized.

10. The method of operating a radio receiver connected to a currentsource, and audio frequency translating means connected to said radioreceiver, which comprises continuously varying the tuning of the radioreceiver from one wave length to any one of a plurality of desired wavelengths, by a progressive uninterrupted adjusting movement controlledfrom a remote point, and electrically effecting the silencing of theaudio frequency translating means in response to a condition establishedand maintained by the adjusting movement while maintaining allconnections of the current source to said radio receiver.

11. In a remotely controlled radio receiving system a radio receiverhaving a tuning element and audio frequency translating meanselectrically connected to said radio receiver, operating means forprogressively actuating said tuning element, sources of energizingpotentials connected to said radio receiver at all times during theoperation thereof, means at a remote point for controlling the operationof said operating means, and means maintained effective only in responseto the uninterrupted actuation of said tuning element for silencing saidaudio frequency translating means.

In witness whereof, I hereunto subscribe my name this 3rd day ofSeptember A. D.

VIRGIL M. GRAHAM.

